Finding the Product of Roots in a Cubic Polynomial

Consider the polynomial equation given by:

$f(x) = 2x^3 - 9x^2 + 12x - 4$

If $a$ and $b$ are the roots of the equation $f(x) = 0$, what is the value of $a imes b$?

Express your answer as a decimal in the grid-in section.